WebNN: Support all the device types for WPT validation tests
This CL sets the device type when creating the context in WPT validation
tests to ensure that we get the correct opSupportLimits.
Bug: 356764569
Change-Id: I3e4944dc67060f1db398d450c9308462df6ffb2e
Cq-Include-Trybots: luci.chromium.try:win11-blink-rel,mac14.arm64-blink-rel,mac14-blink-rel
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5769292
Reviewed-by: ningxin hu ningxin.hu@intel.com
Commit-Queue: Bin Miao bin.miao@intel.com
Reviewed-by: Weizhong Xia weizhong@google.com
Reviewed-by: Austin Sullivan asully@chromium.org
Cr-Commit-Position: refs/heads/main@{#1342167}